Calculator v1.0

Features

• Input check
• Auto completion
• Result history

What's Changed

• fix: fix calculating null string error and add brackets validation by @o3o1 in #1
• feat: realtime input check and auto completion by @o3o1 in #2
• feat: add symbol support, add time column in history by @o3o1 in #3

New Contributors

• @o3o1 made their first contribution in #1

Full Changelog: v0.1...v1.0